My home and septic system is about 28 years old as was pumped 2 years ago. I have, what seems to be, a couple of construction debris trenches parallel and downhill to my drain field which started to collapse 3-4 years ago. With the heavy rains south-central PA this summer, the collapse of the tranches seems to be increasing. Recently I noted on a non-rainy week some effluent bubbling up at the trench closest to the drain field. My initial thought is that due to the proximity of the trench to the drain field this may just be leakage since the soil may be at near saturation. Anything I need to look for before calling in a professional? I'd hate to replace the field if I don't have to.